Speaker
Description
To meet the demand for high-intensity ion beams in FLASH radiotherapy and materials science, achieving millisecond-scale ultra-fast slow extraction from synchrotrons is a critical challenge. Conventional slow extraction methods, such as RF-KO, take seconds and are inadequate for FLASH's requirement of >40 Gy/s dose rates. Overcoming this requires innovative beam dynamics based on Autoresonance. Autoresonance is a nonlinear phenomenon where particles become phase-locked to a sweeping frequency drive, causing their amplitudes to grow together in sync. Unlike conventional RF-KO, which randomly fills phase space, Autoresonance creates a "hollow beam" profile. To achieve this, strong nonlinearities are essential. Based on the HIRFL-CSRm lattice, this research proposes introducing octupole magnets to work alongside existing sextupoles, thereby strengthening the detuning coefficient and lowering the Autoresonance threshold. Single-cycle frequency sweep excitation was simulated to induce rapid and controlled beam spill. This approach will be modeled using the HIRFL-CSRm lattice to explore the impact of sextupole resonance strength and octupole-induced detuning on the Autoresonance condition. Success will be experimentally validated onHIRFL-CSRm, paving the way for FLASH cancer therapy and advanced nuclear materials testing.
| Paper status | No proceeding file submitted. |
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